Study on the Mixed Corrosion Resistance of Yttria-Stabilised Zirconia Thermal Barrier Coating to Cmas and Nacl

Abstract

The effect of CaO-MgO-Al2O3-SiO2 (CMAS) and NaCl on the corrosion mechanism of thermal barrier coatings (TBCs) was revealed through experiments and finite element simulations. Yttria-stabilised zirconia (YSZ) TBCs were prepared via atmospheric plasma spraying. Subsequently, the corrosion experiments of the TBCs for resistance to CMAS and NaCl were conducted at 1250℃. The results indicated that the melting sequence of CMAS and NaCl can affect the TBCs failure mode.The main reason for TBCs failure was the thermal-mechanical damage generated by CMAS and the chemical reaction between CMAS and thermal growth oxides, and the thermal-chemical damage wasn′t the main reason.

Keywords: A. Thermal barrier coatings, A. CMAS+NaCl, B. Finite element method, B. Raman spectroscopy, C. Buckling failure, C. Spalling failure